Angle in hand tracking?

Hello, Hi, I’m trying to get the angle of the hand with the hand-tracking project but the result is always zero.

this.el.sceneEl.addEventListener('xrhandfound', (event) => {
      const handData = event.detail
      const handRotation = handData.transform.rotation
      console.log('Angulo de rotación: ', handRotation)
    })

the result in console always is: Angulo de rotación: {w: -1, x: 0, y: 0, z: 0}
Even using ‘xrhandupdated’ the result is the same.

I need to take the angle of the hand in real time to be able to develop my expertise.
can help me, please?